Rounding error. Dividing 10 by 3 gives you exactly 3⅓, so 3⅓ times 3 equals exactly 10.
The problem comes when representing ⅓ as a decimal number. Dividing 10 by 3 gives us 3.333..., not 3.333000. ⅓ as a decimal number repeats infinitely.
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Using calculator, we cannot get 10 when we add 3.3333...
together 3 times.